Evaluation to digital filtering to obtain Sagnac shift in open loop‐IFOG

Abstract

Purpose

The purpose of this paper is to find the best way to obtain the Sagnac phase shift in the output signal of open loop interferometric fiber optic gyroscopes (IFOGs). Also, the utilized digital filtering based on FIR kaiser window for implementing the digital signal processing part is evaluated.

Design/methodology/approach

The approach is based on implementing four kaiser FIR filters, the coefficients of which have been obtained from SPtool. They were simulated with SPtool in the Matlab 7.1.

Findings

The results show that the chosen computational method has reliable accuracy. On the other hand, it could require low‐computational effort, and it is a simple way which is important for the signal processors.

Research limitations/implications

The limitation in this paper is that the designed filters have high order and they require much time; therefore, a high‐speed device is needed. For solving this problem, it is proposed to perform some estimation by experiments.

Practical implications

IFOGs are used in aircraft, missiles, and new civil fields such as automobile navigation, antenna stabilization, crane control, unmanned vehicle control, wind, and renewable energy platform stabilization.

Originality/value

There is no other paper which has explained mathematics of IFOG implementation in the signal processing part as completely as is done here.

Citation

Reza Nasiri Avanaki, M. and Toloei, A. (2009), "Evaluation to digital filtering to obtain Sagnac shift in open loop‐IFOG", Aircraft Engineering and Aerospace Technology, Vol. 81 No. 5, pp. 391-397. https://doi.org/10.1108/00022660910983662